Get rid of GeoFunctionConditional, part 1

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23525 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Get rid of GeoFunctionConditional, part 2

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23527 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e